Back-rest for metal-reducing machines.



No. 886,293. ,Y PATNTED APR. 28, 1908.

B. M; W.. HANSGN. BACK REST POR METAL RE-DUONG MACHINES.

APPLICATION FILED SEPT. B, 1905.

New intiem'.

c aitiiogrA of Letters Patent. 'Appiiugn :uediseimmher 53,1905. --seriai'ibl`27vg4a' f 'Sluiting iir inaccuracies' tension to unduly ycrowd 1ie'e-tion of 'the reducing-- ti'dalli'in'its with hut fefufti'u'verses of the red'eing tool.

-ln tl'ieaccompgiiying dran-ings"Figure 1 is 'V elevation', ol a oonstr'uerio'n embodying' the invention; and Fig'. fi is .i detail View he-.i'eiiialter inentione(l. l"'igs. l5, 4 and' 5 are "detail views "of 'n angleleveij'and off the backrest-proper' supfoiiieil thereby.

'Referringto the d iaii-'ii'igs the numeral l indicates u. ee'tioi'i of the waywl'iicli supports the head and. tail-stuud@of :i grindingana fehi-ne of theclasls used 'for' cylindrical grinding, and'in which Hur-work travels and the wheel-support is stationary, and 2 a. haek- 'rest stc eili"wliich shown in sei-:tion and is titte-d to the uur :ind clamped thereto by means eonstituti v partol the iinproveinent. It will he observed tliitthe wlay is not o l' the dove-tailed vslfi'a'p'e usually 'employed7 but is iliade in the truncated fornishown with the guiding-edges' sloping towards a ooin'nio'iipoint, with a flat topflf, find 'with a central 'Pelot` -3 'for the recept-ion of devices for clamping the Il'iaekdest'stoek and the he'ad and tail-stocks, as will he hereinafter described. A

Designated"hy 6 ie iifsliaft with iin-eeeer'itricY end 7, said ha'ft being lit-ted hito the stock 2 at rigliba-ngles'to tlieT-slot .5, and `sleeved on the eccentric. end 7 is a clamp S which instead 'of being of the forni' fioiniiionly employed with T-slots is "f an L-shape forni, as shown, the L-part of said clamp being iliade Sulliei'ently narrow to enter-the throat of the T slot. A handle 9' is secured to the sliaft', and serves to operate the saine.

' Designated by 1U is a. plunger abutting at one end 'against the extremity 'or' the eccentrioshaft, vand said plunger .serves to locatethe L-sliaped clamp v in the T-slot 5 before the shaftvis'turned to operat-e'said clamp. A helical spring Il is"'inserted in a chain ber of the lunger and in 'a s injiilar eh'amber 'f the sto'e dr base and'siaid spring ser'yes no rinall-y to ,p'usli'ft'hei plunge-r and Shaft) 6 el'ndwi'se'fand there" to' fdretlieile'dge or Sl'iinildei of the L-sliaped ela'np beneath 'overhan'f "of the T-fflot.' This ijlispositibn 'oT' parte constitutes i Wilu'alile featureof'the inve'iitiiiinffoi byri't 'the application. refini'loifa'l oi thehac'lrest as afwliole is greatly Sinp filed. `"':ljle'r'it may he Stated 'that the. features just 4described are i'i"ot necessarily ivoted at 13 in a recess .13' in the top of` the base or stock 2 is an angle-lever 14, hav- Y ing tubular pivot-bosses 14", and one arm of which extends to the ri ht, is split at its end at 14', and 'carries in tie split-part a screw 15, said split part being clamped against the screw by a bo t 16. In this arm of said lever is formed a perforation 17 for the reception of a rod 18, which is secured to .the top of the base 2 by apin 19. At'its top the perform tion' 17'- opens in to a cup-shaped or ,partis herical` recess .20, and said perforation, is el? slvhtly greater diameter than the diame- 20 ter o? the rod 18 for a purpose hereinafter described. Loose upon ythe rod 18 is a washer 21 having a convex surface which lits. in the recess 20, and above said washer, and surrounding the rod, is a helical spring 25 22. For a portion of its length the rod 18 is threaded at 1S', and in engagement with this threaded portion is a thumb-nut- 23.

By -the means Vjust described a certain amountl of an ular motion of the leve'r 14 is permittedon t surface of the washer 21 rests .in the corresponding socket in the lever-arm, distorted action of the spring is4 prevented. Pivoted by stub-shafts, or trunnions- 24 in in clined seats 14a of the upper slotted arm 142 of the lever 14 is a work-supporting hanger or backrest proper 25, and said lever-arm 14z is slotted at 26 to permit 4the movement of said hanger, and is longitudinally grooved at 27 for a purpose hereinafter (.lescribed. This hanger 25 is of peculiar shape, it .being provided with an angular portion 28, from an intermediate part o'fwlnch the trunnions 24 roject, and with a shoe 29, curved at 30 to it the work, as illustrated in Figs. 1 and 5.

Designated b 31 Vis a rod which is pinned in an opening othe arm 14z of lever 14 adjacent to the vertical part of said lever, and pi voted at 32 in separated ears 145 of said vertical part is a' lever 33, the latter having a tubular boss 34 with a concave recess 34', and throu h which boss the rod 31 passes. Loose ont e rod 31, and bearing against the boss 34 is a washer 35 convex on its under sideto fit the' recess 34', and surrounding a threaded part 31' of said rod is'a helical s ring 36, against which a 'nut 374 bears, through the intermediate washer 37', as shown inFig. 1. At its free end the lever 33 is provided with a downwardly-projecting,

curved nose '38, ,which Vbears against the ortion 28 ofthe back-rest lever 2S, as i ustratedin said Fig. l. Adjacent to the-nose 38 the lever 33 is split B5 to receive a screw -39 having a knurled-head e pivot 13, and as thespherical 39', and the split-parts of said lever are clamped upon said screw by a bolt 40. At its lower cxtremitv the screw 39 is provided with around tip 41, which ts in the roove 27 in the arm 142 of the lever 14, an when the work has been reduced the amount desired engages the bottomwall of the groove 27.

To prevent detritus from the grindingwheel or other reducing-tool 42 from being thrown uponthe base 2 and guideway 3, a curved plate or shield 43 is secured by a screw 44 to an extension 45 of said w'ay.

ln the operation of my invention work designated by 46 is centered between the traveling-head and, tail-stocks (not shown), andthe back-rest stock 2 is adjusted along the way 1 luntil the hanger 25 is brought to the desired location 'with relation to said work, and the lever 9 is then grasped and turned to cause the eccentric 7 to actuate the clamp 8 and bindthe stock rigidly in place. As the spring-actuated lever 33 bears against the arm'28 of the hanger 25, said hanger will be caused to rock onits trunnions 24, and the seat 30 will be forced against the stock under yieldingr pressure. By adjusting the screw 39 the limit of downward movement of the'lever 33 is readily regulated, the rounded end 41 of said screw servingas a stop for this urpose.` As the grinding-wheel or other reV ucing-tool traverses the work, more or less lateral pressure is imparted thereto, and as this occurs the hanger tends to rock on its trunnionsLand its arm 2S by pressing against the nose 38 of lever 33 will tend to raise said lever on its pivot 32, against the tension of s ring 36, and to throw down the rear arm of t e lever 14, this action being, however, resisted by the screw 15, which is set normally to hold said lever 14 in the desired position. Consequently after the hanger hasbeen placed in position with'its shoe against the stock any yielding movement of the same due to the various causes above mentioned will be resisted by the lever 33 the' bearing pressure of which against the arm 28 is controlled lby ad'usting the tension of the spring 36. As sai lever 33 swings on its pivot the convex washer 35 rocks in the concave seat 34 and prevents the spring 3.6 from disalinement. As will be ev1dentv the spring 22 on rod 18 continually tends to force the rear arm of lever 14 downward and the forward arm'upward thus causing an upward movement of the shoe 29 agamst the stock, whereas the spring-controlled lever 33 operating on the short arm '2'8 of the hanger will tend to force said shoe into substantial lateral engagement with the stock, the long are of piovemeptlpf lthe 'shoe struckllrom tige pivots int o t e anger a roac n su stantially0 a straight line. will thils be seen that pressure is applied to the shoe of the hanger on substantially radial lines at right angles to each other, and that the shoe 13 0 adjusted that their.

N' ii is caused tofoll duced in diameter and to keep in close enteesehenil-.in-Fleisf completedgand .l the end .of -tl'ie screws v1-5 vv8I,15d-13,9. l'ffl mEq-opgaat. wi th Ithe.- stock and (ever-15; grtyspectlnfeglyfabn t it .w il lebe. undergtood ,mettant-the lbeginning of operation these screws which act as stops, .and Wiithergeinafter be so referred to, are sn points will be .free from ver and stock. .ln other justable stops and ,lliereitwn'iaybestated.that other forms of ,stops .,ayfbesubstituted for them without '":de ant'gure'from, the invention. ntprphrangeable hangers may be. provided fliavingrcencave seats or shoes of (.lifl'erent ,liadius-,.so tl'iat stock of various diameters accommodated, and various means different rom thedeviees shown may be einployedforfsupporting the hangers, and for causing.thejShoes-thereon to follow up the. stekvithout departure from the invent/ion. Sojtometherrmeans maybe'provided for per- ,niittin 'gf"a yielding movementf the hanger under' the-conditions above mentioned, .and Vst'i ll,.b,e. within the purview ofthe inven tion. While .one back-rest is shown it will be understood that as lmany as are necessary for stock-supporting. 'purposes may be disposed along ,the machine-bed.

Changes may be made in the form and iroportions of thevarious velementsgind various devices nlfay -also' be employed for securing the stock to the bed.

Having thus described my invent-ion, what I claim is:

1. The combination, with a support having a slot, of a stock mounted on the support; a clamp inserted throu h the throat ot the slo'tand laterally move le in said slot 5 and means for actuating saidclamp to cause it to secure the stock to fthe support.

2. The combination, with a support having a T-slot; a .stock mounted on thesuppor't; a clamp having a projection, and insertible through the throat of the T-slot; means whereby said clamp may be moved lateraly to force its projection beneath the overhang of the slot; and means for actuating the clamp.

3. The combination, with a support having a T-slot, of a stock on the support; an L-shaped clamp insertible through the. throatof the T-slot; means -for moving said clamp laterally to cause its L part to pass I' ,cpntach wit-1 ),v said le ,words thescrewsact as ad beneatl'i the overhangr of the slot; and means carried by the -stock for actuating the clamp.

i l.. 1. ow up thestock it is re- "l he 'reduci ngo pera'titn'i l ifl eeved upon the eccentric,

. bore of the. outer arm of said device ism engagement.

a nd means 'for forcing' said shaft and clamp ei'idn'ise to cause the clamp "to pass beneath the overhang of the slot.

5.T.hc combination; with a support having,aT'-slot,.off'a.device mounted on su id support;a'chinip"carried by said device., and having alat'eral project-'ion insert-ibie through the 'throat of theiT-sldt'means for forcing sind clamp endn'ise 'to carry. its projection beneath the overhang of thefslot, and means for actuating the cii'nnp. I

fi'. The coini'iina-tion, witha support having a T-slot', oi a stock monnted,foesliding adjust'nn-vnt upon said support-said Stock having a bore; a shaft inserted in the bore .of the stock, and carrying an eccentric; an L-shaped clamp sleeved upon the .portion of the shaft: a handle carried bythe shaft; and .a s[. ring-a tu.a ted plunger for 't endwise. to carry the clamp `part of the. shaft g forcingI the sind. beneath the overhangr of the slot.' .1,

7. rThe combination, with a support. .l-iav-t ing a T-slot, of a stock .mounted 'for adjustment on said support, said stock havinga transverse bore, a shat" t inserted in''the 'bore of the stock, and. having an eccentric; lan L-shaped clamp sleeved upon the eccen'tri a chambcred. 4plunger bearing against thient'l' of said shaft and a. spring inserte'f'l intl're chamber of the plunger, and bearing against the stock, said spring servingio force 'the shaft endwise to carryY the L- art o'f the clamp beneath. the'overhang ot' t ie sloth '8. The combination, with a stoclcof a two-armed lever p ivoted thereto, and hav'- ing seats at the end oi its inner arm; an angular hanger provided with trunnions for entering said seat-s; a Work-su port carried by one arm oi' the hanger; a ever pivoted to -an intermediate part of said two-armed ever; and inea-ns for forcing the end of'said ever against an arm of said hanger.

S). The combination, with a stock, of a lever pivoted thereto, and having an arm rojeetmg from each side of its pivot; a ro( secured to the. stock, and passing through a said lever.; a spring surroundingr the rod a Washer intermediate the. spring and said outer arm g a rod secured to the inner arm of the lever 5 a device pivoted to the lever, and through which said rod passes; a spring surrounding the rod; a Washer intermediate said spring and said'device 3 and a movably mounted hanger carrying a work-support, and with a part of which 10. The combination, with a stock, of a tivo-armed lever ivoted thereto; a stop on one arm of said lever; n'ieans for applying yielding pressure to said arm g a devlce pivote-d to the. lever intermediate the arms thereof ,'a stop carried by said device; means for imparting yielding pressure to said device; an angular hanger journaled on the inner arm of said lever, and against an arm of eccentric which said device bears; and a work-support carried by the other arm of said hanger.

11. The combination, with a stock, of a two-armed lever pivoted therto a rod assing through an opening in one arm of said lever, and secured to the stock; a washer sursupport carried by and rounding the rod, and having a .convex bearing surface fitted in a seat of said, arm; a spring on the rod above the washer; a nut in engagement with a threaded part of the rod, serving to adjust lthe tension of the spring; a Work-support lrnovably mounted on the other arm of said'lever; and a yield- -ing device bearing against a part of said twoarmed lever pivoted thereto; a Work' the inner arm of said lever; a yieldin device carried by said inner arm, and bearing against a part of the Worksupport; and ayieldlng-device bearing against the outer arm of said lever.

14. The combination, with a stock, of a two-armed lever pivoted thereto.; a yielding device bearing against the outer arm of said lat the end of said lever; a stop carried by said outer arm; e Work-supporting hanger carried by the inner arm of said lever; alcver pivoted to the twoarmed lever and bearing against a part of said hanger; e stop carried by saidlever; and means for applying yielding .pressure to the pivoted lever.

15. The combination, with a stock, of a two-armed lever pivoted thereto; means for applying yielding-pressure to one arm of seid lever.; a work-su port movably mounted on the other arm ofpsaid lever; andvmeans carried by. the two-armed lever for applying yielding pressure to said worksu port.

16. ,he combination, with a Inacllinesbed, of a stock adjustable thereon; a two-armed lever pivoted to the stock, and having en aperture in its rear arm, and a concevesent aperture; a rod secured to the stock, and'passing through the aperture, said rod having a threaded portion; a convex 'washer on the rod and fitting in said concave seat; a coiled s ring on the rod above the washeua nut or adjustingthe tension of said spring; a Work-support carried by the other'arm of said lever; and means for applying yielding pressure to the Work-support. In testimonywhereof I alii): my signature in presence of two witnesses.

BENGT M. W. HANSON. Witnesses FRANCES E. BLoDGE'r'r, F. E. ANDERSON. 

